Combined conveyer and scraper for centrifugal machines.



B. D. GOPPAGE; COMBINED GONVEYER AND SGRAPER POR GENTRIPUGAL MACHINES.

APPLICATION PILED SEPT. I6, 1911. i

Patented Juml 11, 1912.

@hum/Lto@ BENJAMIN DENVER COPPAGE, OF WILMINGTON, DELAWARE.

COMBINED coNvEY'ER AND scRALPEB. Fon CENTRIFUGAL MACHINES..

Specification of Letters Patent. Patented June 11, 1912.

Application led September 16, 1911. Serial N o. 649,606.

To all whom t may concern: l

Be it known that I, BENJAMIN DEN-ven Corman, of Wilmington, Delaware, have invented a new and useful Improvement in Combined -Conveyers and Scrapers for Centrifugal-Machines, which invention is fully set forth in the following specification.

In using a centrifugal machine of-the type illustrated in S. Letters Patent to C. S. Lee, No. 882,256, dated March 17, 1908, a clearance between the peripheral edge of the fixed .spiral conveyer blade or blades and the inner surface of the rotatable cylindrical screen or rotor results `in the format-ion about the -inner surface of the perforated wall of the drum of a thin covering of the material being acted upon. In drying sand, for example, thefthin covering of sand thus.formed/permits water to drain therethrough and be discharged through the perforations of the rotor by the centrifugal action. But in acting upon other materials, such for'example as coal, for drying the same preparatory to coking, which coal contains small portions of clay,` or coal dust, or both, there is a tendency to form about the interior surface of the rotor a tightlyv compat/ed covering which is impervious to water and hence interferes with the expulsion of the water therethrough and through the perforations of the rotor by centrifugal action. As a covering of material about the interior surface of the rotor 'aifordsna frictional contact with and grip upon` the .main body ofthe material in the rotor in causing said material to be whirled about withthe rotor, such covering is in that-respect an advantage. i y

My present invention provides a combined conveyer and scraper designed-particularly as to\those materials which tend Ato form a compact and impervious coverf ing-to Vscrape a suiclent area of the 1n' terior surface ofthe .rotor to permit the expulsion, through the perforated.wall of the drum, of the water to be extracted, and

also adapted to advance the material being acted upon through the drum at the desired speed of travel.

Reference to the-accompanying drawing illustrating one embodiment thereof willfacilitate an understanding of the invention and a detailed description thereof. In said through a rotatable perforated' screen, cylinder or drum and the combined scraper and conveyer Wit-hin the same; and Fig. 2

is a transverse section through the same.

In dotted lines, there is shown a portion of a rotatable perforated or foraminated screen, cylinder or drum 5, designated the 6 is a fixed shaft or core extending axially through` the rotor and preferably square in cross-section. From said shaft there is supported what is in effect a single flight spiral ribbon conveyer made up of repeated groups n of successive approximately quarteihcircle overlapping sections 7, 8, 9 and 10. The section 7 is adapted to contact the inner surface of the rotor and act not only to ad.

vancematerial but also toscrape from a through a bolt 13 acting upon a rubber or spring buffer 14 seated against a shoulder on the arm, acts to hold the edgeof the Y section 7in-contact with the surface of the rotor 5. The end of section 7 Vslightly over-v laps the end of section 8, which in turn slightly overlaps section 9. Section 9 overlaps section 10, which latter overlaps a second section 7; and so on.

the forked inner end of which embraces and'is. pivoted to core 6 by a bolt y16. The

vent 'this land preserve avdesired clearancel between the edge of section 9'and the surface ofthe drum, a bolt 17 carried by the arm/15 contacts core 6. Bolt 17 isadjustable to vary the clearance between the edge 9 and the rotor wall. Sections 8 and 10 are also carried by arms similar to arm 15 and having adjustable stops lsimilar to bolt 17 for-.preserving the desired clearance between the edges of these sections and the Wall of the rotor.

In the operation of the machine, in which the rotor is operated at high speed-such as one thousand revolutions aminute--the section or sections 7 of the blade in contact with the rotor scrape from a portion of the interior surface of the rotor any cover- Sect-ion 9, for example, 1s secured4 to an -inclmed arm A15,

'portion of the interior surface of the rotor ing of the material tending to .form thereon, -While the other sections, by -reason of their slight clearance from the rotor,'perv mit a thin layer around parts of the inner surface of :the rotor, -Which layer affords a .frictional AContact with andgrip` upon the main-.body of the material,a s beforestated'.

' WhatI claim'is-i v 1. In a 'centrifugal machine, the combinatien. with a perforated drum or rotor, of-a .spiral conveyer blade insaid rotor formed of a succession of overlapping sections each movable independently of other sections With relation to the interior surface'of'the rotor.

2. In ja centrifugal'machine, the combina` tion with a perforated drmor rotor, of a core extending longitudinally in said rotor, and a spiral conveyer blade in said rotor formed 1n sections each pivotally supportedl from said core for movement toward or from 'the interior surface of the rotor.

3., In a centrifugal machine, thecombinationl'with a perforated drum or rotor, of a core extending longitudinally in said rotor,

a spiral conveyer blade in' said rotor formed 1n sect1ons,'and supportlng arms extending between said core and said blade sections respectiv'ely, each arm being secured at its outer end to its blade section and at its inneren pivotally joined to .the core.

4. In a centrifugal machine, the combinaf tion with a perforated drum or rotor, of a In testimony whereof I have signed this specification in the presence of two subscribring witnesses.

BENJAMIN DENVER COPPAGE.'

Witnesses ELBERT H. NEESE, C. STEWART LEE. 

